From The Collaborative International Dictionary of English v.0.48 :
Hybridize \Hy"brid*i`ze\, v. t. [imp. & p. p. Hybridized; p. pr. & vb. n. Hybridizing.] To render hybrid; to produce by mixture of stocks. [1913 Webster]From WordNet (r) 3.0 (2006) :
hybridizing n 1: (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids [syn: hybridization, hybridisation, crossbreeding, crossing, cross, interbreeding, hybridizing]